Well, Thomaz will win it. There's no doubt.
I will explain you why.
Djokovic No°1 in Champions Race '08
Rafael Nadal No°2 in Champions Race '08
so: Djokovic > Nadal
as we know: Anderson > Djokovic
so the question is:
Does anybody truly believe that Kevin Anderson has a better game than Thomaz?
If you answer this question with "No." , there can be only one winner on Monday/Tuesday and he's from Sao Paolo.